由(you)(you)于(yu)在(zai)(zai)戶(hu)(hu)外、室內等區域，無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)的信(xin)(xin)(xin)號(hao)強度較弱(ruo)，而且采用(yong)(yong)(yong)頻率調制技術（如 MHZ、 NMR、 BSI等）產(chan)生的信(xin)(xin)(xin)號(hao)傳輸時(shi)延大，傳輸距(ju)離遠。因此有線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)不適合在(zai)(zai)戶(hu)(hu)外環境使用(yong)(yong)(yong)，特別(bie)是(shi)在(zai)(zai)冬天及低風速季(ji)節使用(yong)(yong)(yong)。雖然無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)也有著(zhu)不錯的效(xiao)果(guo)。但由(you)(you)于(yu)系統(tong)工作時(shi)會有一定(ding)的干擾，使對(dui)(dui)(dui)講(jiang)(jiang)(jiang)效(xiao)果(guo)下降，另外在(zai)(zai)信(xin)(xin)(xin)號(hao)較弱(ruo)時(shi)對(dui)(dui)(dui)用(yong)(yong)(yong)戶(hu)(hu)語音產(chan)生了影響。特別(bie)是(shi)在(zai)(zai)人(ren)員復雜(za)、通信(xin)(xin)(xin)距(ju)離較短或需(xu)要(yao)較長時(shi)間使用(yong)(yong)(yong)時(shi)。因此，更(geng)需(xu)要(yao)有一個可(ke)靠的無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)提供與(yu)有線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)一樣的語音信(xin)(xin)(xin)息與(yu)控制。無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)具有很(hen)高的靈(ling)活性，它能夠(gou)滿足現場(chang)中(zhong)所有環境使用(yong)(yong)(yong)需(xu)求并能隨(sui)時(shi)切換（如在(zai)(zai)野(ye)外、戶(hu)(hu)外電話等),用(yong)(yong)(yong)戶(hu)(hu)可(ke)以(yi)在(zai)(zai)任何地點使用(yong)(yong)(yong)、隨(sui)時(shi)、隨(sui)地進行通訊。使用(yong)(yong)(yong)方便、節省成本、節約費用(yong)(yong)(yong)。下面(mian)我們來了解一下無(wu)(wu)(wu)線(xian)(xian)(xian)對(dui)(dui)(dui)講(jiang)(jiang)(jiang)系統(tong)它主要(yao)是(shi)什么優點？

1.性能穩定，可靠性高

在(zai)相同無(wu)(wu)線(xian)(xian)(xian)傳輸距離下，無(wu)(wu)線(xian)(xian)(xian)傳輸信(xin)(xin)號(hao)更穩定由于使(shi)用(yong)了功率放(fang)大器來對無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)進行壓縮和放(fang)大，使(shi)無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)更加(jia)穩定可靠(kao)。無(wu)(wu)線(xian)(xian)(xian)信(xin)(xin)號(hao)在(zai)弱(ruo)電磁(ci)環境下也能(neng)(neng)(neng)保持較(jiao)好(hao)的(de)性能(neng)(neng)(neng)。無(wu)(wu)線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)具有(you)(you)(you)發射(she)功率小、抗(kang)千(qian)擾(rao)(rao)(rao)能(neng)(neng)(neng)力強(與(yu)(yu)有(you)(you)(you)線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)比較(jiao))和抗(kang)電磁(ci)干擾(rao)(rao)(rao)能(neng)(neng)(neng)力強(與(yu)(yu)有(you)(you)(you)線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)比較(jiao))的(de)特點。無(wu)(wu)線(xian)(xian)(xian)對講(jiang)系(xi)統(tong)發射(she)信(xin)(xin)號(hao)在(zai)發射(she)前和發射(she)后(hou)均能(neng)(neng)(neng)保持良好(hao)的(de)性能(neng)(neng)(neng)，使(shi)用(yong)過程中，發射(she)信(xin)(xin)號(hao)與(yu)(yu)接收信(xin)(xin)號(hao)完全不受任何千(qian)擾(rao)(rao)(rao)，可保持很好(hao)的(de)穩定性，具有(you)(you)(you)良好(hao)的(de)抗(kang)千(qian)擾(rao)(rao)(rao)性和抗(kang)低(di)頻干擾(rao)(rao)(rao)能(neng)(neng)(neng)力，即(ji)使(shi)在(zai)惡(e)劣的(de)環境下也能(neng)(neng)(neng)保持較(jiao)好(hao)的(de)性能(neng)(neng)(neng)。因此(ci)無(wu)(wu)線(xian)(xian)(xian)系(xi)統(tong)有(you)(you)(you)較(jiao)高的(de)可靠(kao)性。

2.功(gong)耗小、不(bu)受天氣、濕度的影響(xiang)

無(wu)線(xian)對(dui)(dui)講系(xi)統在不(bu)同的(de)環(huan)境(jing)(jing)中，無(wu)線(xian)通(tong)信設備和有線(xian)通(tong)信設備一(yi)樣都(dou)要進行電(dian)(dian)能(neng)的(de)消耗(hao)(hao)(hao)。當(dang)環(huan)境(jing)(jing)溫(wen)(wen)度(du)在-40°C以下時(shi)(shi)，無(wu)線(xian)通(tong)信設備需(xu)要每天工作(zuo)(zuo)8小(xiao)時(shi)(shi)左(zuo)右;當(dang)環(huan)境(jing)(jing)溫(wen)(wen)度(du)為(wei)-20°C時(shi)(shi)，每天工作(zuo)(zuo)8小(xiao)時(shi)(shi)左(zuo)右;當(dang)環(huan)境(jing)(jing)溫(wen)(wen)度(du)為(wei)-30°C時(shi)(shi)，每天工作(zuo)(zuo)4小(xiao)時(shi)(shi)左(zuo)右。目前市場上(shang)常見的(de)無(wu)線(xian)對(dui)(dui)講系(xi)統有兩(liang)(liang)種(zhong)(zhong)電(dian)(dian)源(yuan)(yuan)輸入方式(shi)，一(yi)種(zhong)(zhong)是(shi)電(dian)(dian)源(yuan)(yuan)輸入，另一(yi)種(zhong)(zhong)是(shi)電(dian)(dian)源(yuan)(yuan)輸出。從這兩(liang)(liang)種(zhong)(zhong)方式(shi)對(dui)(dui)系(xi)統的(de)功(gong)耗(hao)(hao)(hao)來(lai)看，電(dian)(dian)源(yuan)(yuan)輸入方式(shi)的(de)功(gong)耗(hao)(hao)(hao)更(geng)大一(yi)些，但是(shi)功(gong)耗(hao)(hao)(hao)很(hen)小(xiao)。并且設備的(de)工作(zuo)(zuo)環(huan)境(jing)(jing)不(bu)同，對(dui)(dui)電(dian)(dian)池的(de)需(xu)求量也不(bu)同，所(suo)以功(gong)耗(hao)(hao)(hao)也不(bu)同。

3信號不受干擾

在(zai)一些有(you)(you)干(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)地方(fang)，例(li)如野(ye)外(wai)、機場、工(gong)廠等，一般采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式。分(fen)(fen)頻(pin)(pin)(pin)(pin)方(fang)式的(de)(de)(de)(de)(de)抗(kang)(kang)干(gan)(gan)擾(rao)(rao)(rao)能(neng)力(li)不強(qiang)(qiang)(qiang)，其(qi)(qi)抗(kang)(kang)干(gan)(gan)擾(rao)(rao)(rao)能(neng)力(li)主要(yao)取決于(yu)射(she)頻(pin)(pin)(pin)(pin)功(gong)率的(de)(de)(de)(de)(de)大(da)小。分(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術的(de)(de)(de)(de)(de)功(gong)率一般是(shi)50dB在(zai)50dB左右時，其(qi)(qi)抗(kang)(kang)干(gan)(gan)擾(rao)(rao)(rao)能(neng)力(li)強(qiang)(qiang)(qiang)。但由于(yu)分(fen)(fen)頻(pin)(pin)(pin)(pin)的(de)(de)(de)(de)(de)干(gan)(gan)擾(rao)(rao)(rao)與(yu)噪聲(主要(yao)是(shi)周邊(bian)噪聲)具有(you)(you)很強(qiang)(qiang)(qiang)的(de)(de)(de)(de)(de)互通性，當(dang)分(fen)(fen)頻(pin)(pin)(pin)(pin)發(fa)射(she)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)超過50dB時，其(qi)(qi)抗(kang)(kang)千擾(rao)(rao)(rao)能(neng)力(li)就(jiu)會減(jian)弱。另外(wai)，在(zai)一些有(you)(you)噪音的(de)(de)(de)(de)(de)環(huan)境中(zhong)使(shi)(shi)用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術，會使(shi)(shi)分(fen)(fen)頻(pin)(pin)(pin)(pin)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)無(wu)法到達發(fa)射(she)端(duan)(duan)的(de)(de)(de)(de)(de)接(jie)收(shou)機或(huo)者造(zao)成發(fa)射(she)端(duan)(duan)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)與(yu)接(jie)收(shou)端(duan)(duan)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)糟合而造(zao)成分(fen)(fen)頻(pin)(pin)(pin)(pin)或(huo)干(gan)(gan)擾(rao)(rao)(rao)(例(li)如在(zai)使(shi)(shi)用(yong)室外(wai)電話(hua)時) 。而采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術的(de)(de)(de)(de)(de)無(wu)線(xian)(xian)對講系(xi)統由于(yu)發(fa)射(she)功(gong)率小，分(fen)(fen)頻(pin)(pin)(pin)(pin)后(hou)的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)(qiang)度比有(you)(you)線(xian)(xian)對講系(xi)統高很多(在(zai)實(shi)際使(shi)(shi)用(yong)中(zhong)分(fen)(fen)頻(pin)(pin)(pin)(pin)設備一般可以(yi)將系(xi)統信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)分(fen)(fen)頻(pin)(pin)(pin)(pin)到50dB以(yi)上),信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)不受(shou)干(gan)(gan)擾(rao)(rao)(rao)。如果采用(yong)分(fen)(fen)頻(pin)(pin)(pin)(pin)技(ji)術，需要(yao)在(zai)較大(da)的(de)(de)(de)(de)(de)回波功(gong)率下才能(neng)實(shi)現(xian)(xian)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)的(de)(de)(de)(de)(de)分(fen)(fen)頻(pin)(pin)(pin)(pin)工(gong)作(如分(fen)(fen)頻(pin)(pin)(pin)(pin)器發(fa)射(she)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)與(yu)接(jie)收(shou)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)重疊(die)時產生(sheng)的(de)(de)(de)(de)(de)千擾(rao)(rao)(rao))和(he)發(fa)送(song)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)(qiang)度降低(di)(同頻(pin)(pin)(pin)(pin)帶內(nei)的(de)(de)(de)(de)(de)兩只天線(xian)(xian)對同一信(xin)(xin)(xin)(xin)(xin)(xin)道傳(chuan)輸的(de)(de)(de)(de)(de)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)強(qiang)(qiang)(qiang)度基本一致);如果采用(yong)混響技(ji)術，則可以(yi)實(shi)現(xian)(xian)對無(wu)線(xian)(xian)信(xin)(xin)(xin)(xin)(xin)(xin)號(hao)(hao)干(gan)(gan)擾(rao)(rao)(rao)的(de)(de)(de)(de)(de)抑制(zhi)或(huo)降低(di)。